refactor: 确立独立子工程架构 (backend, admin, mpuniapp) 并同步更新 AGENTS.md 规范

backend/src/modules/base/entity/base.ts

@@ -0,0 +1,65 @@
+import { Index, PrimaryGeneratedColumn, Column } from 'typeorm';
+import * as moment from 'moment';
+import { CoolBaseEntity } from '@cool-midway/core';
+
+/**
+ * 时间转换器
+ */
+export const transformerTime = {
+  to(value) {
+    return value
+      ? moment(value).format('YYYY-MM-DD HH:mm:ss')
+      : moment().format('YYYY-MM-DD HH:mm:ss');
+  },
+  from(value) {
+    return value;
+  },
+};
+
+/**
+ * Json转换器
+ */
+export const transformerJson = {
+  to: value => value,
+  from: value => {
+    // 确保从数据库返回的是对象
+    if (typeof value === 'string') {
+      try {
+        return JSON.parse(value);
+      } catch (e) {
+        return value;
+      }
+    }
+    return value;
+  },
+};
+/**
+ * 实体基类
+ */
+export abstract class BaseEntity extends CoolBaseEntity {
+  // 默认自增
+  @PrimaryGeneratedColumn('increment', {
+    comment: 'ID',
+  })
+  id: number;
+
+  @Index()
+  @Column({
+    comment: '创建时间',
+    type: 'varchar',
+    transformer: transformerTime,
+  })
+  createTime: Date;
+
+  @Index()
+  @Column({
+    comment: '更新时间',
+    type: 'varchar',
+    transformer: transformerTime,
+  })
+  updateTime: Date;
+
+  @Index()
+  @Column({ comment: '租户ID', nullable: true })
+  tenantId: number;
+}